I have Aqueon 10 and Tetra 10i filters. For both, I don't use the cartridges. Instead I stuff them with aquaclear foam and for the Aqueon, I add some more foam to the outflow. The bacterial live mostly in the filter and in this cause - the foam. If you use the cartridges and throw them out every month- you toss out the bacteria you want. This is why alot of people like the aquaclear filters - you don't replace all the filter media at once nlike you do with a traditional filter cartridge.
I won an aquaclear 70 on ebay for $10 BUT iwould of had to empty out 2 large tanks in order to move the shelf out a few inches to fit the filter. I put it in my sisters goldfish tank.
I like the tetra in tank filters because they go inside the tank. Some of my tanks are only 1-2 inches from the wall and a HOB won't fit
Hpwever in my 5 gallon, I took my sisters Aquaculture or whatever walmart sells since I gave her the other filter. The current was too strong so I stuffed the aquaclear foam at the outflow which works nicely but the stupid thing is loud. Out of the 3 filters I have in my bedroom - THAT is the only one I hear.
Last edited by Tikibirds; 11-30-2012 at 03:27 AM.